It does make sense on a birth certificate. As soon as I have a document with my current picture on it, and/or other biometric info, gender is no longer a necessity on a document IMHO.

Only for the continuation of the species, not personally. So you are ok!

Like: man, I really want to play some co-op, and nobody is here to play with me.

Or courtesy of election rigging, depending on who you believe.